Expansion valve



FIG. 1 is a front perspective view of an expansion valve, showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left-side elevation view thereof; and,

FIG. 8 is a right-side elevation view thereof.

The broken lines are for the purpose of illustrating portions of the expansion valve and form no part of the claimed design. 

CLAIM The ornamental design for an expansion valve, as shown and described. 